Add renames in output when using the mirror helper library.

sdk/lib/_internal/compiler/implementation/mirror_renamer/renamer.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of mirror_renamer;
 
 class MirrorRenamer {
   static const String MIRROR_HELPER_CLASS = 'MirrorHelper';
   static const String MIRROR_HELPER_GET_NAME_FUNCTION = 'getName';
+  static const String MIRROR_HELPER_ADD_RENAME_FUNCTION = 'addRename';
+
   static const String MIRROR_HELPER_LIBRARY_NAME = 'mirror_helper.dart';
   static const String MIRROR_HELPER_LIBRARY_PREFIX = 'm';
   static const String MIRROR_HELPER_CLASS_FULLY_QUALIFIED_NAME =
       '$MIRROR_HELPER_LIBRARY_PREFIX.$MIRROR_HELPER_CLASS';
 
+  static Map<String, String> inverseRenames;
+
   static void handleStaticSend(Map<Node, String> renames, Element element,
                                Send node, Compiler compiler) {
   if (element == compiler.mirrorSystemGetNameFunction) {
     renames[node.selector] = MIRROR_HELPER_GET_NAME_FUNCTION;
     renames[node.receiver] = MIRROR_HELPER_CLASS_FULLY_QUALIFIED_NAME;
     }
  }
 
   static void addMirrorHelperImport(Map<LibraryElement, String> imports) {
     Uri mirrorHelperUri = new Uri(path: MIRROR_HELPER_LIBRARY_NAME);
     // TODO(zarah): Remove this hack! LibraryElementX should not be created
     // outside the library loader. When actual mirror helper library
     // is created, change to load that.
     LibraryElement mirrorHelperLib = new LibraryElementX(
         new Script(mirrorHelperUri, null));
     imports.putIfAbsent(mirrorHelperLib, () => MIRROR_HELPER_LIBRARY_PREFIX);
   }
+
+  static void registerRenames(Map<Node, String> renames) {
+    inverseRenames = new Map<String, String>();
+
+    for (Node node in renames.keys) {
+      if (node is Identifier) {
+        var stringValue = node.asIdentifier().source.stringValue;
+        if (stringValue != renames[node]) {
+          inverseRenames.putIfAbsent(renames[node], () => stringValue);
+        }
+      }
+    }
+  }
 }